Display device having a solar cell layer

ABSTRACT

Disclosed is a display device including a solar cell so as to use power produced by a solar energy, and a method for manufacturing the same, wherein the display device includes light-emitting areas provided on a lower substrate, and a solar cell layer provided on an upper substrate confronting the lower substrate, and provided to produce power by absorbing light, wherein the light-emitting areas include first to third light-emitting areas, and the solar cell layer includes first to third organic solar cell layers which are disposed to areas corresponding to the first to third light-emitting areas.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No.10-2015-0169355 filed on Nov. 30, 2015, which is hereby incorporated byreference as if fully set forth herein.

BACKGROUND

Field of the Disclosure

Embodiments of the present disclosure relate to a display device and amethod for manufacturing the same.

Discussion of the Related Art

With the advancement of an information-oriented society, variousrequirements for the display device of displaying an image areincreasing. Thus, there are various display devices of liquid crystaldisplay (LCD) devices, plasma display panel (PDP) devices, organic lightemitting display (OLED) devices, etc.

Recently, the display device is applied to portable devices such assmart phones, tablets, notebook computers, and the like. Generally, theportable device is used while a user who carries the portable device ismoving. Thus, it is difficult to additionally supply external power tothe portable device. That is, the portable device uses an internalbattery as a power supply source. For this reason, a manufacturer of theportable device has been studied for a method of improving a capacity ofthe internal battery or minimizing power consumption in the displaydevice so as to use the portable device for long periods of time withoutadditionally supplying external power.

SUMMARY

Accordingly, embodiments of the present disclosure are directed to adisplay device that substantially reduces one or more problems due tolimitations and disadvantages of the related art, and a method formanufacturing the same.

An aspect of embodiments of the present disclosure is directed toprovide a display device including a solar cell so as to use powerproduced by solar energy, and a method for manufacturing the same.

Additional advantages and features of embodiments of the disclosure willbe set forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice ofembodiments of the disclosure. The objectives and other advantages ofembodiments of the disclosure may be realized and attained by thestructure particularly pointed out in the written description and claimshereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purposeof the various embodiments of the present disclosure, as broadlydescribed herein, there is provided a display device that may includelight-emitting areas provided on a lower substrate, and a solar celllayer provided on an upper substrate facing the lower substrate, andprovided to produce power by absorbing light, wherein the light-emittingareas include first to third light-emitting areas, and the solar celllayer includes first to third organic solar cell layers which aredisposed in areas corresponding to the first to third light-emittingareas.

In another aspect of embodiments of the present disclosure, there isprovided a method for manufacturing a display device that may includeforming light-emitting area for emitting light on a lower substrate,forming a first electrode on an upper substrate facing the lowersubstrate, forming a hole transporting layer on the first electrode,forming first to third organic solar cell layers on the holetransporting layer, forming a black matrix on the first to third organicsolar cell layers, wherein the black matrix is disposed in edges of thefirst to third organic solar cell layers, providing an electrontransporting layer on the first to third organic solar cell layers andthe black matrix, and providing a second electrode on the electrontransporting layer, wherein the second electrode is disposed to areascorresponding to the first to third organic solar cell layers.

It is to be understood that both the foregoing general description andthe following detailed description of embodiments of the presentdisclosure are exemplary and explanatory and are intended to providefurther explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of embodiments of the disclosure and are incorporated inand constitute a part of this application, illustrate embodiment(s) ofthe disclosure and together with the description serve to explain theprinciple of embodiments of the disclosure. In the drawings:

FIG. 1 is a block diagram illustrating a display device according toembodiments of the present disclosure;

FIG. 2 is an exemplary view illustrating further details of a displaydevice according to embodiments of the present disclosure;

FIG. 3 is a cross sectional view illustrating detailed parts of displaydevice according to embodiments of the present disclosure;

FIGS. 4A and 4B are exemplary views illustrating acceptors included infirst to third organic solar cell layers according to embodiments of thepresent disclosure;

FIGS. 5A and 5B are exemplary views illustrating donors included infirst to third organic solar cell layers according to embodiments of thepresent disclosure;

FIG. 6 is a graph showing a light-absorbing wavelength range of a donormaterial including P2, as shown in FIG. 5B;

FIG. 7 is a flow chart illustrating a method for manufacturing a displaydevice according to embodiments of the present disclosure; and

FIGS. 8A to 8H are cross sectional views illustrating a method formanufacturing a display device according to embodiments of the presentdisclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to the exemplary embodiments of thepresent disclosure, examples of which are illustrated in theaccompanying drawings. Wherever possible, the same reference numberswill be used throughout the drawings to refer to the same or like parts.

Advantages and features of the present invention, and implementationmethods thereof will be clarified through following embodimentsdescribed with reference to the accompanying drawings. The presentinvention may, however, be embodied in different forms and should not beconstrued as limited to the embodiments set forth herein. Rather, theseembodiments are provided so that this disclosure will be thorough andcomplete, and will convey the scope of the present invention to thoseskilled in the art. Further, the present invention is only defined bythe claims.

A shape, a size, a ratio, an angle, and a number disclosed in thedrawings for describing embodiments of the present disclosure are merelyexemplary, and thus, the present disclosure is not limited to theillustrated details. Like reference numerals refer to like elementsthroughout. When a detailed description of a known function orconfiguration is determined to unnecessarily obscure the description ofthe various embodiments of the present disclosure, then such detaileddescription will be omitted, since it is known to those of skill in theart.

In a case where ‘comprise’, ‘have’, and ‘include’ described in thepresent specification are used, another part may be added unless ‘only’is used. The terms of a singular form may include plural forms unlessreferred to the contrary.

In construing an element, the element is to be construed as includingsome tolerance for errors, although there is no explicit description.

In describing a position relationship, for example, when the positionalorder is described as ‘on’, ‘above’, ‘below’, and ‘next’, a case whichis not in contact may be included unless further limiting words areexpressly added to exclude such meaning.

In describing a time relationship, for example, when the temporal orderis described as ‘after’, ‘subsequent’, ‘next’, and ‘before’, a casewhich is not continuous or has intervening steps may be included unlessfurther limiting words are expressly added, such as ‘just’ or ‘direct.’

It will be understood that, although the terms “first”, “second”, etc.may be used herein to describe various elements, these elements shouldnot be limited by these terms. These terms are only used to distinguishone element from another. For example, a first element could be termed asecond element, and, similarly, a second element could be termed a firstelement, without departing from the scope of the present disclosure.

Also, “X-axis direction”, “Y-axis direction”, and “Z-axis direction” arenot limited to a perpendicular geometric configuration. That is, “X-axisdirection”, “Y-axis direction”, and “Z-axis direction may include anapplicable wide range of a functional configuration.

Also, it should be understood that the term “at least one” includes allcombinations related with any one item. For example, “at least one amonga first element, a second element and a third element” may include allcombinations of two or more elements selected from the first, second andthird elements as well as each element of the first, second and thirdelements. Also, if it is mentioned that a first element is positioned“on” or “above” a second element, it should be understood that the firstand second elements may be brought into contact with each other, or athird element may be interposed between the first and second elements.

Features of various embodiments of the present disclosure may bepartially or overall coupled to or combined with each other, and may bevariously inter-operated with each other and driven technically as thoseskilled in the art can sufficiently understand. The embodiments of thepresent disclosure may be carried out independently from each other, ormay be carried out together in co-dependent relationship.

Hereinafter, a display device according to embodiments of the presentdisclosure and a method for manufacturing the same will be described indetail with reference to the accompanying drawings.

FIG. 1 is an exemplary view illustrating a display device according toembodiments of the present disclosure. FIG. 2 is an exemplary viewillustrating a lower substrate, source drive ICs, source flexible films,a circuit board, a timing controller, a system board, a first battery,and a second battery in the display device according to embodiments ofthe present disclosure.

The display device according to one or more embodiments of the presentdisclosure may include any display device with line scanning forsupplying gate signals to gate lines (G1˜Gn), or any display device withline scanning for providing data voltages to pixels. For example, thedisplay device according to embodiments of the present disclosure may berealized in a liquid crystal display device, an organic light emittingdisplay device, a field emission display device, and an electrophoresisdisplay device. Hereinafter, for convenience of explanation, it shows acase wherein the display device according to embodiments of the presentdisclosure is realized in an organic light emitting display device.

Referring to FIGS. 1 and 2, the display device according to one or moreembodiments of the present disclosure may include a display panel 10, agate driver 11, a data driver 20, a timing controller 30, a system board40, a first battery 50, and a second battery 60.

The display panel 10 may include a lower substrate 111 and an uppersubstrate 112. On the lower substrate 111, there is a display area (DA)having data lines (D1˜Dm, ‘m’ is an integer of 2 or more than 2), gatelines (G1˜Gn, ‘n’ is an integer of 2 or more than 2), and light-emittingareas disposed in regions corresponding with intersections of the datalines (D1˜Dm) and the gate lines (G1˜Gn) (e.g., at pixels P). Thedisplay panel 10 is divided into the display area (DA) and a non-displayarea (NDA). The display area (DA) is an area for displaying an image bythe light-emitting areas. The non-display area (NDA) is an area providedin the periphery of the display area (DA), wherein an image is notdisplayed in the non-display area (NDA). Each of the light-emittingareas includes an organic light emitting device. The light-emitting areawill be described in detail with reference to FIG. 3.

A solar cell layer is provided in the upper substrate 112 of the displaypanel 10, and the solar cell layer converts incident light intoelectrical power. The solar cell layer may include a plurality oforganic solar cell layers. The solar cell layer will be described indetail with reference to FIG. 3.

The gate driver 11 supplies gate signals to the gate lines (G1˜Gn). Indetail, the gate driver 11 receives a gate control signal (GCS),generates the gate signals in accordance with the gate control signal(GCS), and supplies the generated gate signals to the gate lines(G1˜Gn).

The gate driver 11 may be provided in the non-display area (NDA) by agate driver in panel (GIP) method. In FIG. 1, the gate driver 11 isprovided in the non-display area (NDA) outside of one side of thedisplay area (DA), but embodiments provided herein are not limited tothis structure. For example, the gate driver 11 may be provided in thenon-display area (NDA) outside of both sides of the display area (DA),as shown in FIG. 2.

The gate driver 11 may include a plurality of gate drive integratedcircuits (hereinafter, referred to as ‘gate drive IC’). The gate driveICs may be mounted on the gate flexible films. Each of the gate flexiblefilms may be a gate carrier package or a chip on film. The gate flexiblefilms may be attached to the non-display area (NDA) of the display panel10 by a tape automated bonding (TAB) method using an anisotropicconductive film, whereby the gate drive ICs may be connected with thegate lines (G1˜Gn).

The data driver 20 receives digital video data (DATA) and data controlsignals (DCS) from the timing controller 30, and converts the digitalvideo data (DATA) into analog data voltages in accordance with the datacontrol signal (DCS). The data driver 20 supplies the analog datavoltages to the data lines (D1˜Dm). The data driver 20 may include atleast one source drive IC 21.

Each of the source drive ICs 21 may be manufactured in a driving chip.Each of the source drive ICs 21 may be mounted on a source flexible film70. Each source flexible film 70 may be realized in a tape carrierpackage or a chip on film, and each source flexible film 70 may be bentor curved. Each source flexible film 70 may be attached to thenon-display area (NDA) of the display panel 10 by a tape automatedbonding (TAB) method using an anisotropic conductive film, whereby thesource drive ICs 21 may be connected with the data lines (D1˜Dm).

Each of the source drive ICs 21 may be directly attached to the lowersubstrate 111 by chip on glass (COG) method or chip on plastic (COP)method, and may be connected with the data lines (D1˜Dm).

The source flexible films 70 may also be attached to one or more circuitboards 80. The circuit boards 80 may be flexible printed circuit boardscapable of being bent or curved. In this case, one circuit board 80 or aplurality of circuit boards 80 may be provided.

The timing controller 30 receives video data (DATA) and timing signals(TS) from the system board 40. The timing signals may include a verticalsynchronization signal, a horizontal synchronization signal, a dataenable signal, a dot clock, and etc.

The timing controller 30 generates the gate control signal (GCS) forcontrolling an operation timing of the gate driver 11, and generates thedata control signal (DCS) for controlling an operation timing of thedata driver 20 on the basis of driving timing information stored in amemory such as an electrically erasable programmable read-only memory(EEPROM). The timing controller 30 supplies the gate control signal(GCS) to the gate driver 11. The timing controller 30 supplies the videodata (DATA) and data control signal (DCS) to the data driver 20.

The timing controller 30 may be mounted on the circuit board 80, asshown in FIG. 2. The circuit board 80 may be connected with the systemboard 40 through a flexible cable (FC) such as flexible flat cable (FFC)or flexible printed circuit (FPC). The flexible cable (FC) connects aconnector (C1) provided in the circuit board 80 with a second connector(C2) provided in the system board 40.

The system board 40 may include an application processor (AP) or agraphic processing unit (GPU) for supplying the video data (DATA) andtiming signals (TS) to the timing controller 30. The graphic processingunit (GPU) or application processor (AP) converts theexternally-provided video data (DATA) into a type appropriate for thedisplay panel 10, and outputs the converted type appropriate for thedisplay panel 10.

The first battery 50 serves as a first power supply for supplying afirst power voltage to the system board 40 via a first power supply line(PSL1). The second battery 60 serves as a second power supply forsupplying a second power voltage to the system board 40 via a secondpower supply line (PSL2) when the first battery 50 is discharged.

The second battery 60 receives a charging current (CV) from the solarcell layer of the display panel 10. The second battery 60 may be chargedwith the charging current (CV) of the solar cell layer. For example, ananode of the second battery 60 is connected with a first electrode forcollecting holes of the solar cell layer, and a cathode of the secondbattery 60 is connected with a second electrode for collecting electronsof the solar cell layer, whereby the second battery 60 is charged.

Meanwhile, it is possible to omit the second battery 60. In this case,the first battery 50 may be supplied with the charging current (CV) fromthe solar cell layer of the display panel 10. The charging current (CV)may be supplied from the display panel 10 to the second battery 60through the source flexible film 70, the circuit board 80, the flexiblecable (FC), the system board 40, and charging line (CL).

As described above, the display device according to the embodiment ofthe present disclosure includes the solar cell layer for convertingincident light into power, whereby the second battery 60 is charged withthe charging current (CV) from the solar cell layer. As a result, if thefirst battery 50 is discharged, the second battery 60 is used as anauxiliary power source. Hereinafter, the display device according to theembodiment of the present disclosure will be described in detail withreference to FIG. 3.

FIG. 3 is a cross sectional view illustrating detailed parts of thedisplay device according to the embodiment of the present disclosure.

Referring to FIG. 3, thin film transistors 210 are provided on the lowersubstrate 111. Each of the thin film transistors 210 may include asemiconductor layer 211, a gate electrode 212, a source electrode 213,and a drain electrode 214. In FIG. 3, the thin film transistors 210 areformed in a top gate method wherein the gate electrode 212 is positionedabove the semiconductor layer 211, but embodiments provided herein arenot limited to this method. For example, the thin film transistors 210may be formed in a bottom gate method wherein the gate electrode 212 ispositioned below the semiconductor layer 211, or a double gate methodwherein the gate electrode 212 is positioned both above and below thesemiconductor layer 211.

On the lower substrate 111, there are the semiconductor layers 211. Abuffer film (not shown) may be provided between the lower substrate 111and the semiconductor layers 211. Also, an insulating interlayer 220 maybe provided on the semiconductor layers 211, the gate electrodes 212 maybe provided on the insulating interlayer 220, and a gate insulating film230 may be provided on the gate electrodes 212. Then, the source anddrain electrodes 213 and 214 may be provided on the gate insulating film230. Each of the source and drain electrodes 213 and 214 may beconnected with the semiconductor layer 211 via a contact holepenetrating through the insulating interlayer 220 and the gateinsulating film 230.

A planarization film 240 may be provided on the source and drainelectrodes 213 and 214. The planarization film 240 is provided tomaintain flatness in pixels divided by banks 255. The planarization film240 may be formed of resin such as photo acryl or polyimide.

Then, organic light emitting devices are provided on the planarizationfilm 240. Each of the organic light emitting devices may include ananode electrode 251, an organic light emitting layer 253, and a cathodeelectrode 254. The organic light emitting devices are divided by thebank 255.

The anode electrodes 251 are provided on the planarization film 240.Each of the anode electrodes 251 is connected with the drain electrode214 via a contact hole penetrating through the planarization film 240.

The bank 255 is provided to divide the anode electrodes 251. The bank255 covers each edge of the anode electrodes 251.

The organic light emitting layer 253 is provided on the anode electrodes251 and the banks 255. Each organic light emitting layer 253 may includea hole transporting layer, a light emitting layer, and an electrontransporting layer. In this case, if a voltage is applied to the anodeelectrode 251 and the cathode electrode 254, the hole and electron aretransferred to the light emitting layer through the hole transportinglayer and the electron transporting layer, and are combined in the lightemitting layer, to thereby emit light.

The organic light emitting layer 253 may include only white lightemitting layer for emitting white light. In this case, the white lightemitting layer may be provided on an entire surface of the display area(DA). The organic light emitting layer 253 may include a red lightemitting layer for emitting red light, a green light emitting layer foremitting green light, and a blue light emitting layer for emitting bluelight. In this case, the red light emitting layer is formed only in redlight-emitting areas (RE), the green light emitting layer is formed onlyin green light-emitting areas (GE), and the blue light emitting layer isformed only in blue light-emitting areas (BE). The red light-emittingareas (RE) may refer to first light-emitting areas, the greenlight-emitting areas (GE) may refer to second light-emitting areas, andthe blue light-emitting areas may refer to third light-emitting areas.

The cathode electrode 254 is provided on the organic light emittinglayers 253 and the banks 255, to thereby cover the organic lightemitting layers 253 and the banks 255.

The organic light emitting display device may be formed in the topemission method. In case of the top emission method, light emitted fromthe organic light emitting layer 253 advances toward the upper substrate112, whereby the thin film transistors 210 are largely provided underthe bank 255 and the anode electrode 251. That is, a design area of thetransistor 210 in the top emission method is relatively larger than adesign area of the transistor in the bottom emission method. In case ofthe top emission method, the anode electrode 251 is formed of a metalmaterial with high reflectance, for example, aluminum (Al) or depositionstructure of aluminum (Al) and indium-tin-oxide (ITO) so as to obtain amicro-cavity effect, preferably. Also, in case of the top emissionmethod, since the light of the organic light emitting layer 253 advancestoward the upper substrate 112, the cathode electrode 150 may be formedof a transparent metal material capable of transmitting lighttherethrough, for example, indium-tin-oxide (ITO) or indium-zinc-oxide(IZO), or may be formed of a semi-transparent metal material, forexample, magnesium (Mg), silver (Ag), or alloy of magnesium (Mg) andsilver (Ag).

An encapsulation layer 260 is provided on the cathode electrode 254. Theencapsulation layer 260 prevents oxygen or moisture from being permeatedinto the organic light emitting layer 253. To this end, theencapsulation layer 260 may include a first inorganic film 261, anorganic film 262, and a second inorganic film 263.

The first inorganic film 261 is provided on the cathode electrode 254,to thereby cover the cathode electrode 254. The organic film 262 isprovided on the first inorganic film 261, to thereby prevent particlesfrom being permeated into the organic light emitting layer 253 and thecathode electrode 254 through the first inorganic film 261. The secondinorganic film 263 is provided on the organic film 262, to thereby coverthe organic film 262.

Each of the first and second inorganic films 261 and 263 may be formedof silicon nitride, aluminum nitride, zirconium nitride, titaniumnitride, hafnium nitride, tantalum nitride, silicon oxide, aluminumoxide, or titanium oxide. For example, each of the first and secondinorganic films 261 and 263 may be formed of SiO2, Al203, SiON, or SiNx.The organic film 262 is formed of a transparent material so that thelight emitted from the organic light emitting layer 253 passes throughthe organic film 262.

The solar cell layer 300 is provided on the upper substrate 112. Thesolar cell layer 300 may include a first electrode 310, a holetransporting layer 320, an organic solar cell layer 330 having first tothird organic solar cell layers 331, 332 and 333, an electrontransporting layer 350, a black matrix 340, and a second electrode 360.

The first electrode 310 is provided on the upper substrate 112 facingthe lower substrate 111. The first electrode 310 may be formed of atransparent metal material such as ITO or IZO enabling a lighttransmission, or may be formed of a semi-transparent metal material suchas magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver(Ag). The first electrode 310 may be provided on an entire surface ofthe display area (DA).

The hole transporting layer 320 may be provided on the first electrode310. The hole transporting layer 320 enables a smooth transmission ofthe hole from the first to third organic solar cell layers 331, 332 and333 to the first electrode 310. In one or more embodiments, the holetransporting layer 320 may be formed ofTPD(N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-bi-phenyl-4,4′-diamine),or NPB(N,N′-di(naphthalen-1-yl)-N,N′-diphenyl-benzidine), but is notlimited to these materials. The hole transporting layer 320 may beprovided on an entire surface of the display area (DA).

The first to third organic solar cell layers 331, 332 and 333 areprovided on the hole transporting layer 320. The first organic solarcell layer 331 is disposed in the red light-emitting areas (RE), thesecond organic solar cell layer 332 is disposed in the greenlight-emitting areas (GE), and the third organic solar cell layer 333 isdisposed in the blue light-emitting areas (BE).

Each of the first to third organic solar cell layers 331, 332 and 333may be formed in a bi-layer or blended layer structure of donor andacceptor materials. Each of the first to third organic solar cell layers331, 332 and 333 may be formed in a structure of disposing the blendedlayer between the donor material layer and the acceptor material layer.The donor material supplies the electron, and the acceptor materialreceives the electron. In order to improve photoelectric efficiency ineach of the first to third organic solar cell layers 331, 332 and 333,the donor material has high light absorbing efficiency and high chargemobility, and the acceptor material has relatively-high electronaffinity and relatively-high charge mobility in comparison to the donormaterial.

The donor material for each of the first to third organic solar celllayers 331, 332 and 333 may be formed of poly(para-phenylenevinylene)(PPV)-based material, derivates of polythiophene(PT),polyfluorene(PF)-based material or their copolymers, or solublepolythiophene(P3HT) of crystalline polymer.

The acceptor material for each of the first to third organic solar celllayers 331, 332 and 333 may be formed of C60 as shown in FIG. 4A, or C60derivates (fullerene derivates) designed to dissolve C60 in an organicsolvent as shown in FIG. 4B. In this case, C60 derivates may be PCBM. Ifthe first to third organic solar cell layers 331, 332 and 333 are formedby a deposition process, the acceptor material is formed of C60.Meanwhile, if the first to third organic solar cell layers 331, 332 and333 are formed of a solution process, the acceptor material is formed ofPCBM.

In each of the first to third organic solar cell layers 331, 332 and333, the hole and electron produced by absorption of solar ray may bedrifted, the hole may be collected in the first electrode 310 throughthe hole transporting layer 320, and the electron may be collected inthe second electrode 360 through the electron transporting layer 350.The first electrode 310 is connected with the anode of the secondbattery 60, and the second electrode 320 is connected with the cathodeof the second battery 60, whereby the second battery 60 is charged bythe first to third organic solar cell layers 331, 332 and 333.

Each of the first to third organic solar cell layers 331, 332 and 333absorbs light with predetermined wavelengths of visible rays, wherebyeach of the first to third organic solar cell layers 331, 332 and 333serves as a color filter. To this end, the respective first to thirdorganic solar cell layers 331, 332 and 333 may have the differentlight-absorbing wavelength ranges and light-transmitting wavelengthranges.

The donor material of the first organic solar cell layer 331 may havethe wavelength range of absorbing light except red light, that is, thedonor material of the first organic solar cell layer 331 may have thewavelength range of transmitting red light. In this case, the firstorganic solar cell layer 331 may function as a red color filter. Also,the donor material of the second organic solar cell layer 332 may havethe wavelength range of absorbing light except green light, that is, thedonor material of the second organic solar cell layer 332 may have thewavelength range of transmitting green light. In this case, the secondorganic solar cell layer 332 may function as a green color filter. Also,the donor material of the third organic solar cell layer 333 may havethe wavelength range of absorbing light except blue light, that is, thedonor material of the third organic solar cell layer 333 may have thewavelength range of transmitting blue light. In this case, the thirdorganic solar cell layer 333 may function as a blue color filter.

For example, the donor material of the first organic solar cell layer331 may include P3HT as shown in FIG. 5A. The donor material of thesecond organic solar cell layer 332 may include JR4-193. The donormaterial of the third organic solar cell layer 333 may include P2 asshown in FIG. 5C.

If the third organic solar cell layer 333 includes the acceptor materialof PCBM, and the donor material of P2, the light-absorbing wavelengthrange is within a range from 600 nm to 800 nm, as shown in FIG. 6.Accordingly, the third organic solar cell layer 333 absorbs the lighthaving the wavelength of 600 nm to 800 nm, and transmits the lighthaving the wavelength of 400 nm to 600 nm. Thus, the third organic solarcell layer 333 transmits the light having the wavelength of 400 nm to600 nm, whereby the third organic solar cell layer 333 functions as ablue color filter or cyan color filter.

The black matrix 340 is provided on the first to third organic solarcell layers 331, 332 and 333, and the black matrix 340 is overlappedwith the bank 255. In this case, the black matrix 340 may be provided inedges of the first to third organic solar cell layers 331, 332 and 333.The black matrix 340 includes a material capable of absorbing the light.The black matrix 340 prevents the light emitted from the neighboringlight-emitting areas from being mixed together.

The electron transporting layer 350 may be provided on the first tothird organic solar cell layers 331, 332 and 333 and the black matrix340. The electron transporting layer 350 is provided for a smoothtransmission of the electron from the first to third organic solar celllayers 331, 332 and 333 to the second electrode 360. In one or moreembodiments, the electron transporting layer 350 may be formed ofPBD(2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole),TAZ(3-(4-biphenyl)-4-phenyl-5-tertbutylphenyl-1,2,4-triazole),Liq(8-hydroxyquinolinolato-lithium),BAlq(Bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium),TPBi(2,2′,2′-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole), andetc., but is not limited to these materials. The electron transportinglayer 350 may be provided on an entire surface of the display area (DA).

The second electrode 360 is provided on the electron transporting layer350, and the second electrode 360 is disposed corresponding to the firstto third organic solar cell layers 331, 332 and 333. In this case, thesecond electrode 360 may be overlapped with the first to thirdlight-emitting areas (RE, GE, BE). The second electrode 360 may beformed of a transparent metal material enabling a light transmission,for example, indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), or maybe formed of a semi-transparent metal material, for example, magnesium(Mg), silver (Ag), or alloy of magnesium (Mg) and silver (Ag).

The first electrode 310 may be connected with a link line (LL) providedin the lower substrate 111 through a conductive adhesive member 410. Theconductive adhesive member 410 may be an anisotropic conductive film oranisotropic conductive paste. The link line (LL) may include aconnection unit (CU) which is provided in the same layer as the sourceand drain electrodes 213 and 214 and is formed of the same material asthose of the source and drain electrodes 213 and 214, and iselectrically connected with the first electrode 310 through theconductive adhesive member 410, and a link unit (LU) which is providedin the same layer as the gate electrode 212, and is formed of the samematerial as that of the gate electrode 212. The connection unit (CU) isconnected with the link unit (LU) via a contact hole penetrating throughthe gate insulating film 230. The link unit (LU) is connected with apad. Accordingly, the first electrode 310 may be connected with thesecond battery 60 through the conductive adhesive member 410, the linkline (LL), and the pad.

Meanwhile, for convenience of explanation, FIG. 3 shows that only thefirst electrode 310 is connected with the link line (LL) of the lowersubstrate 111 through the conductive adhesive member 410. In the samemanner as the first electrode 310, the second electrode 360 may be alsoconnected with another link line of the lower substrate 111 through theconductive adhesive member 410.

The lower substrate 111 and the upper substrate 112 are bonded to eachother by the use of transparent adhesive layer 400. The transparentadhesive layer 400 may be transparent adhesive resin. In detail, thetransparent adhesive layer 400 adheres the second inorganic film 263 ofthe lower substrate 111 with the second electrode 360 and the electrontransporting layer 350 of the upper substrate 112, to thereby bond thelower substrate 111 and the upper substrate 112 to each other.

As described above, the first electrode 310, the first to third organicsolar cell layers 331, 332 and 333, and the second electrode 360 areprovided on the upper substrate 112 of the display device according tothe embodiment of the present disclosure. As a result, the hole andelectron produced by absorption of solar rays in the first to thirdorganic solar cell layers 331, 332 and 333 may be provided to the firstelectrode 310 and the second electrode 360, whereby the second battery60 may be charged. Accordingly, the power produced by the solar energymay be used as the auxiliary power.

Also, the external light may be absorbed in the first to third organicsolar cell layers 331, 332 and 333. As a result, it is possible toprevent visibility from being lowered by the reflection of externallight in the top emission method. Also, there is no need to attach apolarizing plate, which is provided to reduce the reflection of externallight, to the upper substrate 112.

Also, the first to third organic solar cell layers 331, 332 and 333 aredisposed in areas corresponding to the first to third light-emittingareas (RE, GE, BE), and the respective first to third organic solar celllayers 331, 332 and 333 have different light-absorbing wavelength rangesand light-transmitting wavelength ranges. As a result, the first tothird organic solar cell layers 331, 332 and 333 serve as the colorfilters.

FIG. 7 is a flow chart illustrating a method for manufacturing thedisplay device according to embodiments of the present disclosure. FIGS.8A to 8H are cross sectional views illustrating a method formanufacturing the display device according to embodiments of the presentdisclosure. Hereinafter, a method for manufacturing a display deviceaccording to one or more embodiments of the present disclosure will bedescribed in detail with reference to FIG. 7 and FIGS. 8A to 8H.

Firstly, as shown in FIG. 8A, the gate lines, the data lines, the thinfilm transistors 210, the anode electrodes 221, the bank 255, theorganic light emitting layer 253, the cathode electrode 254, and theencapsulation layer 260 are provided on the lower substrate 111.

The lower substrate 111 may be formed of glass or plastic. FIG. 8A showsthat the thin film transistors 210 are formed in the top gate methodwherein the gate electrode is positioned above the semiconductor layer,but embodiments provided herein are not limited to this method. Forexample, the thin film transistors 210 may be formed in the bottom gatemethod wherein the gate electrode is positioned below the semiconductorlayer. The thin film transistors 210 are provided in the display area(DA).

The semiconductor layers 211 are provided on the lower substrate 111.After forming a buffer film (not shown) on the lower substrate 111, thesemiconductor layers 211 may be formed on the buffer film (not shown).The insulating interlayer 220 is provided on the semiconductor layers211, wherein the insulating interlayer 220 is provided to insulate thesemiconductor layers 211 from the other metal materials. The gateelectrodes 212 are provided on the insulating interlayer 220. The gateinsulating film 230 is provided on the gate electrodes 212. The sourceand drain electrodes 213 and 214 are provided on the gate insulatingfilm 230. Before forming the source and drain electrodes 213 and 214,the contact holes penetrating through the insulating interlayer 220 andthe gate insulating film 230 may be formed to expose the semiconductorlayers 211. Accordingly, each of the source and drain electrodes 213 and214 may be connected with the semiconductor layer 211 via the contacthole penetrating through the insulating interlayer 220 and the gateinsulating film 230.

The planarization film 240 is provided on the source and drainelectrodes 213 and 214. The planarization film 240 is provided tomaintain flatness in the pixels divided by the banks 255. Theplanarization film 240 may be formed of resin such as photo acryl orpolyimide.

The anode electrodes 251 are provided on the planarization layer 240.Before forming the anode electrodes 251, the contact holes for exposingthe drain electrodes 214 through the planarization layer 240 may beformed, whereby each of the anode electrodes 251 may be connected withthe drain electrode 214 via the contact hole penetrating through theplanarization layer 240. In case of the top emission method, the anodeelectrode 251 may be formed of the metal material with high reflectance,for example, aluminum (Al) or deposition structure of aluminum (Al) andindium-tin-oxide (ITO) so as to obtain a micro-cavity effect,preferably.

The bank 255 is provided to divide the anode electrodes 251. The bank255 covers each edge of the anode electrodes 251.

The organic light emitting layer 253 is provided on the anode electrodes251 and the banks 255. Each organic light emitting layer 253 may includethe hole transporting layer, the light emitting layer, and the electrontransporting layer. The organic light emitting layer 253 may includeonly white light emitting layer for emitting white light. In this case,the white light emitting layer may be provided on the entire surface ofthe display area (DA). The organic light emitting layer 253 may includethe red light emitting layer for emitting red light, the green lightemitting layer for emitting green light, and the blue light emittinglayer for emitting blue light. In this case, the red light emittinglayer is formed only in red light-emitting areas (RE), the green lightemitting layer is formed only in green light-emitting areas (GE), andthe blue light emitting layer is formed only in blue light-emittingareas (BE).

The cathode electrode 254 is provided on the organic light emittinglayers 253 and the banks 255, to thereby cover the organic lightemitting layers 253 and the banks 255. In case of the top emissionmethod, the cathode electrode 254 may be formed of a transparent metalmaterial, for example, indium-tin-oxide (ITO) or indium-zinc-oxide(IZO), or may be formed of a semi-transparent metal material, forexample, magnesium (Mg), silver (Ag), or alloy of magnesium (Mg) andsilver (Ag).

The encapsulation layer 260 including the plurality of inorganic filmsand at least one organic film is provided on the cathode electrode 254.The first inorganic film 261 may be provided on the cathode electrode254, the organic film 262 is provided on the first inorganic film 261,and the second inorganic film 263 is provided on the organic film 262.The first and second inorganic films 261 and 263 may be formed ofsilicon nitride, aluminum nitride, zirconium nitride, titanium nitride,hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, ortitanium oxide. For example, each of the first and second inorganicfilms 261 and 263 may be formed of SiO2, Al203, SiON, or SiNx. Theorganic film 262 is formed of a transparent material so that the lightemitted from the organic light emitting layer 253 passes through theorganic film 262. (S101 of FIG. 7)

Secondly, as shown in FIG. 8B, the first electrode 310 is provided onthe upper substrate 112 facing the lower substrate 111.

The first electrode 310 may be formed of a transparent metal materialsuch as ITO or IZO enabling a light transmission, or may be formed of asemi-transparent metal material such as magnesium (Mg), silver (Ag), oran alloy of magnesium (Mg) and silver (Ag). The first electrode 310 maybe provided on an entire surface of the display area (DA). (S102 of FIG.7)

Thirdly, as shown in FIG. 8C, the hole transporting layer 320 may beprovided on the first electrode 310.

The hole transporting layer 320 enables a smooth transmission of thehole from the first to third organic solar cell layers 331, 332 and 333to the first electrode 310. The hole transporting layer 320 may beformed ofTPD(N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′biphenyl-4,4′-diamine),or NPB(N,N′-di(naphthalen-1-yl)-N,N′-diphenyl-benzidine), but is notlimited to these materials. The hole transporting layer 320 may beprovided on an entire surface of the display area (DA). (S103 of FIG. 7)

Fourthly, as shown in FIG. 8D, the first to third organic solar celllayers 331, 332 and 333 are provided on the hole transporting layer 320.

The first organic solar cell layer 331 is disposed in the redlight-emitting areas (RE), the second organic solar cell layer 332 isdisposed in the green light-emitting areas (GE), and the third organicsolar cell layer 333 is disposed in the blue light-emitting areas (BE).

Each of the first to third organic solar cell layers 331, 332 and 333may include the donor and acceptor materials. The donor materialsupplies the electron, and the acceptor material receives the electron.If the first to third organic solar cell layers 331, 332 and 333 areformed by a deposition process, the acceptor material is formed of C60.Meanwhile, if the first to third organic solar cell layers 331, 332 and333 are formed of a solution process, the acceptor material is formed ofPCBM. The donor material for each of the first to third organic solarcell layers 331, 332 and 333 may be formed of poly(para-phenylenevinylene)(PPV)-based material, derivates of polythiophene(PT),polyfluorene(PF)-based material or their copolymers, or solublepolythiophene(P3HT) of crystalline polymer. (S104 of FIG. 7)

Fifthly, as shown in FIG. 8E, the black matrix 340 is provided on thefirst to third organic solar cell layers 331, 332 and 333.

The black matrix 340 is provided on the first to third organic solarcell layers 331, 332 and 333, and the black matrix 340 is overlappedwith (e.g., overlying) the bank 255. In this case, the black matrix 340may be provided in edges of the first to third organic solar cell layers331, 332 and 333. The black matrix 340 includes a material capable ofabsorbing the light. The black matrix 340 prevents the light emittedfrom the neighboring light-emitting areas from being mixed together.(S105 of FIG. 7)

Sixthly, as shown in FIG. 8F, the electron transporting layer 350 may beprovided on the first to third organic solar cell layers 331, 332 and333 and the black matrix 340.

The electron transporting layer 350 is provided for a smoothtransmission of the electron from the first to third organic solar celllayers 331, 332 and 333 to the second electrode 360. The electrontransporting layer 350 may be formed ofPBD(2-(4-biphenyl)-5-(4tertbutylphenyl)-1,3,4-oxadiazole),TAZ(3-(4-biphenyl)-4-phenyl-5-tertbutylphenyl-1,2,4-triazole),Liq(8-hydroxyquinolinolato-lithium),BAlq(Bis(2-methyl-8-quinolinolate)-4-(phenylphenolato)aluminium),TPBi(2,2′,2′-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole), andetc., but not limited to these materials. The electron transportinglayer 350 may be provided on an entire surface of the display area (DA).(S106 of FIG. 7)

Seventhly, as shown in FIG. 8G, the second electrode 360 is patterned onthe electron transporting layer 350.

The second electrode 360 is provided on the electron transporting layer350, and the second electrode 360 is disposed corresponding to the firstto third organic solar cell layers 331, 332 and 333. In this case, thesecond electrode 360 may be overlapped with the first to thirdlight-emitting areas (RE, GE, BE). The second electrode 360 may beformed of a transparent metal material enabling a light transmission,for example, indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), or maybe formed of a semi-transparent metal material, for example, magnesium(Mg), silver (Ag), or alloy of magnesium (Mg) and silver (Ag). (S107 ofFIG. 7)

Eighthly, as shown in FIG. 8H, the lower substrate 111 and the uppersubstrate 112 are bonded to each other by the transparent adhesive layer400.

The transparent adhesive layer 400 may be transparent adhesive resin. Indetail, the transparent adhesive layer 400 adheres the second inorganicfilm 263 of the lower substrate 111 with the second electrode 360 andthe electron transporting layer 350 of the upper substrate 112, tothereby bond the lower substrate 111 and the upper substrate 112 to eachother.

The first electrode 310 may be connected with the link line (LL)provided in the lower substrate 111 through the conductive adhesivemember 410. The conductive adhesive member 410 may be an anisotropicconductive film or anisotropic conductive paste. For convenience ofexplanation, FIG. 8H shows that only the first electrode 310 isconnected with the link line (LL) of the lower substrate 111 through theconductive adhesive member 410. In the same manner as the firstelectrode 310, the second electrode 360 may be also connected withanother link line of the lower substrate 111 through the conductiveadhesive member 410.

By way of summation and review, the first electrode 310, the first tothird organic solar cell layers 331, 332 and 333, and the secondelectrode 360 are provided on the upper substrate 112 of the displaydevice according to embodiments of the present disclosure. As a result,the hole and electron produced by absorption of the solar ray in thefirst to third organic solar cell layers 331, 332 and 333 may beprovided to the first electrode 310 and the second electrode 360, sothat it is possible to charge the second battery 60. Thus, the powerproduced by the solar ray may be used as the auxiliary power. In one ormore embodiments, the power produced by solar energy may be used tocharge a primary battery, which may be a sole battery, e.g., inembodiments without a secondary or auxiliary battery.

Also, the external light is absorbed in the first to third organic solarcell layers 331, 332 and 333 of the display device according to theembodiment of the present disclosure. As a result, it is possible toprevent visibility from being lowered by the reflection of externallight in the top emission method. Also, there is no need to attach apolarizing plate, which is provided to reduce the reflection of externallight, to the upper substrate 112.

Also, the first to third organic solar cell layers 331, 332 and 333 aredisposed to areas corresponding to the first to third light-emittingareas (RE, GE, BE), and the respective first to third organic solar celllayers 331, 332 and 333 have different light-absorbing wavelength rangesand light-transmitting wavelength ranges. As a result, the first tothird organic solar cell layers 331, 332 and 333 serve as the colorfilters.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present disclosurewithout departing from the spirit or scope of the disclosures. Thus, itis intended that the present disclosure covers the modifications andvariations of this disclosure provided they come within the scope of theappended claims and their equivalents.

The various embodiments described above can be combined to providefurther embodiments. These and other changes can be made to theembodiments in light of the above-detailed description. In general, inthe following claims, the terms used should not be construed to limitthe claims to the specific embodiments disclosed in the specificationand the claims, but should be construed to include all possibleembodiments along with the full scope of equivalents to which suchclaims are entitled. Accordingly, the claims are not limited by thedisclosure.

What is claimed is:
 1. A display device comprising: a firstlight-emitting area provided on a lower substrate; a secondlight-emitting area provided on the lower substrate; a thirdlight-emitting area provided on the lower substrate; a solar cell layerprovided on an upper substrate facing the lower substrate, the solarcell layer producing power by absorbing light, the solar cell layerincluding first, second and third organic solar cell layers which aredisposed in areas corresponding to the respective first, second andthird light-emitting areas, wherein the solar cell layer includes: afirst electrode provided on the upper substrate; a hole transportinglayer provided between the first electrode and each of the first, secondand third organic solar cell lavers, an electron transporting layerprovided the first, second and third organic solar cell layers, and asecond electrode provided on the electron transporting layer anddisposed in areas corresponding to the respective first, second andthird organic solar cell layers.
 2. The display device according toclaim 1, wherein the first, second and third organic solar cell layershave different light-absorbing wavelength ranges.
 3. The display deviceaccording to claim 1, wherein the first, second and third organic solarcell layers have different light-transmitting wavelength ranges.
 4. Thedisplay device according to claim 1, further comprising a black matrixprovided on the first, second and third organic solar cell layers anddisposed on edge regions of the first, second and third organic solarcell layers.
 5. The display device according to claim 1, wherein each ofthe first and second electrodes is electrically coupled to a respectivelink line provided on the lower substrate through a conductive adhesivemember.
 6. The display device according to claim 1, wherein each of thefirst, second and third light-emitting areas includes an organic lightemitting device, wherein the organic light emitting device includes: ananode electrode; an organic light emitting layer provided on the anodeelectrode; and a cathode electrode provided on the organic lightemitting layer.
 7. The display device according to claim 6, furthercomprising: an encapsulation layer covering the cathode electrode; andan adhesive layer provided between the encapsulation layer and the solarcell layer.
 8. The device of claim 1 further comprising: a first batteryconfigured to supply a first power voltage to a first power voltageline, a second battery configured to supply a second power voltage to asecond power voltage line and being charged with a charging current ofthe solar cell layer.
 9. A device, comprising: a first light-emittingregion on a first substrate; a solar cell layer overlying the firstlight-emitting region, the solar cell layer including: an electrontransport layer; a hole transport layer; and a first organic solar celllayer between the electron transport layer and the hole transport layer;and a second substrate on the solar cell layer.
 10. The device of claim9, further comprising: a second light-emitting region on the firstsubstrate, the second light-emitting region being adjacent to the firstlight-emitting region; a third light-emitting region on the firstsubstrate, the third light-emitting region being adjacent to the secondlight-emitting region, wherein the solar cell layer further includes: asecond organic solar cell layer between the electron transport layer andthe hole transport layer, the second organic solar cell layer overlyingthe second light-emitting region; and a third organic solar cell layerbetween the electron transport layer and the hole transport layer, thethird organic solar cell layer overlying the third light-emittingregion.
 11. The device of claim 10, wherein each of the first, secondand third organic solar cell layers have different light absorption andlight transmissivity characteristics.
 12. The device of claim 10,wherein the first organic solar cell layer includes a red color filter,the second organic solar cell layer includes a green color filter andthe third organic solar cell layer includes a blue color filter.
 13. Thedevice of claim 10, further comprising: a black matrix formed onabutting edge regions of the first and second organic solar cell layers,and the second and third organic solar cell layers; a first electrode onthe hole transport layer; and a second electrode underlying and abuttingthe electron transport layer.
 14. The device of claim 13, furthercomprising: a transparent adhesive material between the first, secondand third light-emitting regions and the second electrode.
 15. Thedevice of claim 14, further comprising: a first conductive member formedthrough the transparent adhesive and coupled to the first electrode; asecond conductive member formed through the transparent adhesive andcoupled to the second electrode; and a battery coupled to the first andsecond electrodes via the first and second conductive members,respectively.